WO2008026908A1 - Procédé de production d'éléments continus en mousse de polystyrène expansé - Google Patents

Procédé de production d'éléments continus en mousse de polystyrène expansé Download PDF

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Publication number
WO2008026908A1
WO2008026908A1 PCT/MX2007/000103 MX2007000103W WO2008026908A1 WO 2008026908 A1 WO2008026908 A1 WO 2008026908A1 MX 2007000103 W MX2007000103 W MX 2007000103W WO 2008026908 A1 WO2008026908 A1 WO 2008026908A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooking
chamber
densities
cooking chamber
density
Prior art date
Application number
PCT/MX2007/000103
Other languages
English (en)
Spanish (es)
Inventor
Héctor PLASCENCIA MORA
Luz Antonio AGUILERA CORTÉS
Original Assignee
Universidad De Guanajuato
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Universidad De Guanajuato filed Critical Universidad De Guanajuato
Priority to EP07834484.3A priority Critical patent/EP2095927B1/fr
Priority to US12/439,661 priority patent/US8551374B2/en
Publication of WO2008026908A1 publication Critical patent/WO2008026908A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
    • B29C44/22—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0461—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other
    • B29C44/0469—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by having different chemical compositions in different places, e.g. having different concentrations of foaming agent, feeding one composition after the other provided with physical separators between the different materials, e.g. separating layers, mould walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/44—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form
    • B29C44/445—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form in the form of expandable granules, particles or beads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3415—Heating or cooling
    • B29C44/3426—Heating by introducing steam in the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
    • B29K2025/04—Polymers of styrene
    • B29K2025/06—PS, i.e. polystyrene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B29K2105/048—Expandable particles, beads or granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0063—Density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/10—Building elements, e.g. bricks, blocks, tiles, panels, posts, beams

Definitions

  • EPS Polystyrene foam
  • the piece is achieved by joining partially pre-molded segments, through the use of a device with two chambers, one for pre-cooking and another for final cooking, allowing materials of equal or different density to be joined both longitudinally and transversally, obtaining thus a new product with mechanical properties located by areas within the piece such as: thermal conductivity, resistance to bending, resistance to compression, modulus of elasticity, etc.
  • the advantage of the possibility of managing the location of densities is that mechanical properties such as thermal conductivity, flexural strength, compressive strength, modulus of elasticity, etc., can be controlled, as required in each application of such that the necessary amount of material to produce the piece is reduced, impacting a reduction in costs.
  • a new process is proposed to manufacture polystyrene foam pieces of arbitrary length and with a mixture of densities located by zones, which consists of the following steps: Pre-expansion of the expandable polystyrene pearl at one or more required densities (from 7.5 up to 60 kg / m 3 ), intermediate rest independently for each material at each density, in containers with meshes that allow the entry of air into the interior (from 3 to 10 hours depending on the density at atmospheric conditions), simultaneous feeding of each density with independent injectors in the desired region within the pre-cooking chamber at a pressure greater than atmospheric, which has one or more dividers that keep the regions separated according to their density during partial cooking using saturated steam with a pressure gauge of 2OkPa for 15 seconds, the pre-cooked element is introduced into an end cooking chamber once the divider is removed and it is held by a jaw during final cooking using saturated steam with a gauge pressure of 10OkPa for 15 seconds.
  • the process already described in the pre-cooking stage is repeated in the pre-cooking chamber, so that consecutive segments are joined to form a piece keep going.
  • Products that can be manufactured through this new process have characteristics that distinguish them from those produced with existing processes.
  • One of the main advantages is the possibility of managing the location of the densities by zones, which allows to control the mechanical properties such as: Thermal resistance (which is in a range between 0.51 - 0.84 m 2 K / W), flexural strength (which is in a range between 70 - 345 kPa), compressive strength (which is between 35-173 kPa), modulus of elasticity (which is between 1-3 MPa), etc.
  • FIG. 2-8 A machine to carry out this process is shown in Figures 2-8 and consists of twenty-two main components: 1. Pusher with density divider, 2. Pearl injectors, 3. Precooking chamber, 4. Separator 5. Chamber of cooking, 6. Jaw, 7. Front door, 8. Cooling system, 9. Roller base, 10. Pre-expanded EPS pearl feed hoppers at different densities, 11. Low pressure steam feed valve , 12. High pressure steam supply valve, 13. Cooking chamber closing system, 14. Front door closing system, 15. Cooling valve, 16. Steam nozzles, 17. Mold backs, 18. Upper chamber mold of cooking, 19. Lower mold cooking chamber, 20. Seal packing between molds, 21 Drains into the atmosphere and 22. Linear actuator.
  • the continuous molding manufacturing process is carried out by the following procedure: First: both steam chambers (3.5) are preheated by opening for 30 seconds the valves (11,12) that operate independently to feed water vapor saturated in the precooking chamber at a manometric pressure of 2OkPa and in the cooking chamber at 100 kPa, the valve connecting the molding chamber to the cooling system is kept open for steam to flow into the atmosphere. Second: The cooking chamber (5) is closed by securing it with its closing system (13), the front door (7) is closed, securing it with its closing system (14), the pusher must be placed with the density divider ( 1) in the retracted position.
  • the pre-expanded EPS bead is injected into different densities stored in the hoppers (10), which in this case are two (may be more), simultaneously in the precooking chamber using commercial injectors.
  • the separator pusher (1) is activated to move the pre-cooked segment to the cooking chamber (5), the cooking chamber (5) is closed and secured with its closing systems (13) to press the pre material -cooked, the separator pusher (1) is returned to its retracted position.
  • Some advantages of producing a piece of EPS continuously and with mixtures of densities are: An element of arbitrary length can be produced using a mold of smaller dimensions than the final piece.
  • the mixture of densities allows to optimize the use of material since by controlling the density of the final piece by zones directly the mechanical properties of this material are manipulated since they depend strongly on the apparent density and thus the elements obtained can have improved properties according to their application.
  • the steps of the traditional process to produce large parts are reduced since using this innovative process only the raw material is pre-expanded, the desired element is rested and molded, instead of first molded a block of dimensions larger than the desired piece, age it 24 hours, mechanize it using hot cutting wires and recycle the leftovers from the block.
  • Figure 2 shows a top view and a side view of the machine for manufacturing EPS elements in a continuous way and with density mixing controlled by zones through the process object of this invention, where the following elements are shown:
  • FIG. 3 A cross-section of the precooking chamber (3) is shown in Figure 3, which consists of the following parts: 1. Pusher with density divider, 2. Pearl injectors, 3. Precooking chamber, 11. Valve Low pressure steam feed, 16. Steam nozzles, 17. Mold backs.
  • the injection of pre-expanded polystyrene pearl at different densities is achieved, by simultaneous injection by the injectors (2), the divider (4) prevents the different materials from mixing.
  • the backrests (17) rest the walls of the mold on the external steam chamber to prevent it from flexing when there is internal pressure.
  • the steam is flowed into the chamber through the nozzles (16) by operating the low pressure steam supply valve (11).
  • FIG. 4 A cross-sectional section of the cooking chamber (5) and jaw (6) consisting of the following parts is shown in Figure 4: (18) Upper mold cooking chamber, (19) Lower mold cooking chamber, (20) Seal packing between molds and (21) Drains into the atmosphere.
  • the cooking chamber (5) is separated vertically into two parts: The upper cooking chamber mold (18) and the lower cooking chamber mold (20), to allow the pre-cooked segment in the precooking chamber ( 3) with a height of 1.05h it can be introduced into this cavity since it has a lower height of 1.02h in the separator (4) and a height h in the jaw (6), where h is the final height of the molded product, once the material to be cooked is introduced, the chamber is closed and steam is introduced through the high pressure steam feed valve (12), and the chamber is subsequently cooled by the cooling system (8).
  • FIG. 5 illustrates the geometric relationships used by the process through a longitudinal section of the mold sections: (3) Precooking chamber, with a chamber height of 1.05h, where h is the final height of the finished product , this section has a length L, (4) Separator, with a closed chamber height equal to 1.02h and with a length equal to 0.5 times L, (5) Cooking chamber, with a closed chamber height equal to and a length equal to L, (6) Jaw, the jaw is part of the cooking chamber because when entering this section a pre-cooked segment is compressed 0.2 times h, exerting a grip fixer that prevents the material from being expelled by pressure of steam once the Front Door (7) is opened
  • Figure 6 shows a detail of the closing system (14) of the front door
  • Figure 7 shows a detail of the mechanical system that allows to open and close the cooking chamber and jaw to allow the passage of a pre-cooked segment to the area of the separator and the cooking chamber, allowing a minimum opening of 1.06 times h, In turn, the system secures the chamber when it is closed, to prevent steam pressure from opening it.
  • Figure 8 shows a section of the longitudinal section of the system composed of the linear actuator (22) and the pusher with a density divider (1), said divider may not be present and the produced parts will have the distribution of densities shown in figure 9a, if a single divider is maintained or if n-dividers are placed, parts are obtained with the density distributions such as those shown in figures 9b and 9c, respectively.
  • Some advantages of producing a piece of EPS continuously and with mixtures of densities are: An element of arbitrary length can be produced using a mold of smaller dimensions than the final piece.
  • the mixture of densities allows to optimize the use of material since when controlling the density of the final piece by zones directly the mechanical properties of this material are manipulated since they depend strongly on the apparent density, according to the innovative process that is claimed, they reduce the steps of the traditional process to produce large pieces because using this process only the raw material is pre-expanded, the desired element is rested and molded, instead of first molding a block of dimensions larger than the desired part, age it 24 hours, mechanize it with hot cutting wires and recycle the leftovers from the block.
  • FIGURES Figure 1. Solid product with mixtures of densities.
  • Figure 2. Side and top views of the assembly for production.
  • Figure 3. Cross section precooking chamber.
  • Figure 4. Section cross section cooking chamber and jaw.
  • FIG. 1 Detail cooking and jaw chamber closure system.
  • Figure 8. Detail of the separator pusher assembly.
  • Figure 9 Diagram of the density distribution obtained: a) without divisor, b) with a divisor and c) with n-divisors.

Landscapes

  • Injection Moulding Of Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Cette invention concerne un procédé industriel permettant de fabriquer des éléments de longueur arbitraire en mousse de polystyrène expansé (EPS) présentant une section transversale constante, avec des mélanges de densités par zones en fonction des exigences des propriétés mécaniques et thermiques de chaque application. Cette invention concerne une machine (dispositif) conçue pour produire les éléments solides avec des mélanges de densités ainsi qu'un produit d'une longueur arbitraire en mousse de polystyrène expansé (EPS) avec une section transversale de géométrie constante sur toute la longueur, avec des densités par zones définies en fonction des exigences mécaniques et thermiques de l'application. La fabrication de ces produits consiste à relier des segments partiellement précuits lesquels peuvent présenter des densités identiques ou différentes avec la possibilité de mélanger différentes densités tant dans la longueur que dans la section transversale. Le mode de réalisation décrit dans cette invention permet de réduire le processus traditionnel à trois étapes, ce qui permet d'économiser considérablement le temps de production. En outre, ce mode de réalisation permet de fabriquer des variantes en dehors du processus traditionnel, ce qui permet d'élargir la gamme des applications de ce type de produits.
PCT/MX2007/000103 2006-08-30 2007-08-30 Procédé de production d'éléments continus en mousse de polystyrène expansé WO2008026908A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07834484.3A EP2095927B1 (fr) 2006-08-30 2007-08-30 Procédé de production d'éléments continus en mousse de polystyrène expansé
US12/439,661 US8551374B2 (en) 2006-08-30 2007-08-30 Method for producing continuous expanded polystyrene foam parts

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MXGT06000017A MXGT06000017A (es) 2006-08-30 2006-08-30 Proceso para producir piezas continuas de espuma de poliestireno expandido.
MXGT/A/2006/000017 2006-08-30

Publications (1)

Publication Number Publication Date
WO2008026908A1 true WO2008026908A1 (fr) 2008-03-06

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Application Number Title Priority Date Filing Date
PCT/MX2007/000103 WO2008026908A1 (fr) 2006-08-30 2007-08-30 Procédé de production d'éléments continus en mousse de polystyrène expansé

Country Status (4)

Country Link
US (1) US8551374B2 (fr)
EP (1) EP2095927B1 (fr)
MX (1) MXGT06000017A (fr)
WO (1) WO2008026908A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1222641A (en) * 1965-04-15 1971-02-17 Saint Gobain Process for producing a cellular product from expanded pearls of synthetic resin
US3674387A (en) 1968-09-06 1972-07-04 Basf Ag Apparatus for the production of continuous lengths of foamed polystyrene
US3709651A (en) * 1970-09-08 1973-01-09 Saint Gobain Apparatus for the production of shaped articles of expanded cohered granules of thermoplastic material, in particular polystyrene
US3830604A (en) 1971-12-02 1974-08-20 Gullifiber Ab Apparatus for producing continuous strands of thermoplastic material
GB1402115A (en) * 1971-09-02 1975-08-06 Foster Grant Co Inc Process for moulding articles from expandable thermoplastics material
US4539167A (en) 1983-04-05 1985-09-03 Schedel Wolfgang E Method of molding an elongate foamed resin article from expandable thermoplastic resin beads
US4695416A (en) 1984-02-29 1987-09-22 Peter Treffner Method and apparatus for mould-forming expanded plastics form blocks
US4756859A (en) * 1985-05-31 1988-07-12 Plastbau A.G. Method for manufacturing elements of expanded synthetic material having layers of particularly high strength and a plant for implementing said method
US5786000A (en) * 1996-08-28 1998-07-28 Berner; Rolf E. Continuous molding machine with pusher
ES2191809T3 (es) * 1996-12-05 2003-09-16 Plastedil Sa Aparato de pared ajustable para moldear un elemento continuo de plastico espumado.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1470412A (fr) * 1966-01-13 1967-02-24 Fresse S A Procédé et dispositif pour la fabrication de corps à structure cellulaire de longueur indéfinie en matière thermoplastique expansée
CH527054A (de) * 1969-12-03 1972-08-31 Confido Treuhand Und Revisions Verfahren und Vorrichtung zur Herstellung von beliebig langen Platten, Blöcken oder sonstigen geformten Teilen aus expandierfähigen Kunststoffen
IT1051111B (it) * 1975-10-24 1981-04-21 Cretti P Macchina per la formazione con procedimento continuo di profilati pieni e cavi in materiale sintetico espanso
NL7614289A (en) * 1976-12-22 1978-06-26 Hendrik Jan Regtuit Synthetic foam profiles prodn. with uniform cross=section - using two: zone mould with plunger and retractable wall
FR2858977A1 (fr) * 2003-08-21 2005-02-25 Bp Chem Int Ltd Composition de polystyrene expansible, procede de fabrication d'objets en polystyrene expanse de moyenne densite, et perles pre-expansees en polystyrene de moyenne densite

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1222641A (en) * 1965-04-15 1971-02-17 Saint Gobain Process for producing a cellular product from expanded pearls of synthetic resin
US3674387A (en) 1968-09-06 1972-07-04 Basf Ag Apparatus for the production of continuous lengths of foamed polystyrene
US3709651A (en) * 1970-09-08 1973-01-09 Saint Gobain Apparatus for the production of shaped articles of expanded cohered granules of thermoplastic material, in particular polystyrene
GB1402115A (en) * 1971-09-02 1975-08-06 Foster Grant Co Inc Process for moulding articles from expandable thermoplastics material
US3830604A (en) 1971-12-02 1974-08-20 Gullifiber Ab Apparatus for producing continuous strands of thermoplastic material
US4539167A (en) 1983-04-05 1985-09-03 Schedel Wolfgang E Method of molding an elongate foamed resin article from expandable thermoplastic resin beads
US4695416A (en) 1984-02-29 1987-09-22 Peter Treffner Method and apparatus for mould-forming expanded plastics form blocks
US4756859A (en) * 1985-05-31 1988-07-12 Plastbau A.G. Method for manufacturing elements of expanded synthetic material having layers of particularly high strength and a plant for implementing said method
US5786000A (en) * 1996-08-28 1998-07-28 Berner; Rolf E. Continuous molding machine with pusher
ES2191809T3 (es) * 1996-12-05 2003-09-16 Plastedil Sa Aparato de pared ajustable para moldear un elemento continuo de plastico espumado.

Also Published As

Publication number Publication date
EP2095927A1 (fr) 2009-09-02
MXGT06000017A (es) 2008-02-28
EP2095927A4 (fr) 2014-05-14
EP2095927B1 (fr) 2019-07-17
US20100244299A1 (en) 2010-09-30
US8551374B2 (en) 2013-10-08

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